Microtest

Dead simple async unit test suite for micropython.

Features:

@test decorator for defining tests

@test
async def one_and_one_should_be_added():
  expect(1 + 1).to_be(2)

Deep assertions

expect([1, 's', ('tuple'), {"a": 1}]).to_be([1, 's', ('tuple'), {"a": 1}])
expect([{"a": 1}]).it_not.to_be([{"a": 2}])

Spies - asserting on function calls (including support for keyword arguments)

  expect(spy_one).to_have_been_called()
  expect(spy_one).to_have_been_called_times(2)
  expect(spy_one).to_have_been_called_with('foo')
  expect(spy_two).to_have_been_called_with(1, param = 2)

Defining one return value or a list of values for future calls

spy_one = spy().returns(10)
expect(spy_one()).to_be(10)

spy_two = spy().define_returns(10, 20, 30)
expect(spy_two()).to_be(10)
expect(spy_two()).to_be(20)
expect(spy_two()).to_be(30)

Asserting on exceptions on async functions and custom exception matching

async def boom():
  await uasyncio.sleep_ms(500)
  raise CustomException("Boom")

await expect(boom).to_throw(CustomException)

Observing events

event = uasyncio.Event()
observer = observe(event)

await some_code_that_should_trigger_event()
await observer.wait()

expect(observer).to_have_been_triggered()

Inverse operator on all assertions (it_not)

expect(1 + 1).it_not.to_be(3)

Mocking modules

network_mock = NetworkMock()
mock_module('network', network_mock)

from network import hostname

@test
async def it_should_mock_network_module():
  hostname()
  expect(network_mock.hostname).to_have_been_called_times(1)

Full async support

async def job():
  await uasyncio.sleep(1)
  return 'it works!'

@test
async def test_should_await():
  expect(await job()).to_be('it works!')

Convenience @only decorator for running specific tests during development

@only
async def one_and_one_should_be_added():
  expect(1 + 1).to_be(2)

See examples.test.py for full examples.

Usage

Just copy microtest.py over to wherever you're using it.

You'll need:

• micropython installed where you're running the tests (I'm using a Mac)
• the uasyncio package installed

You can reference examples.test.py and the Makefile in this repo for tips on running tests with the micropython binary. You can clone this repo and run make tests.

Other projects using microtest:

• pico-w-wlan
• microqueue

This is a work in progress. Mainly using it on side projects and adding to it as needed. I started this because I wanted to run my tests with micropython instead of python for more consistency with the environment where the code runs. I was also looking for something with better uasyncio support.